A question for those who work HF mobile; do you feel thathaving a loading coil and a short whip materially affectsyour QSO capability, as the text books suggest, for ifnot it would seem to suggest that we could all managewith such antennae as our main base air transducers?

Post by Gareth's Downstairs ComputerA question for those who work HF mobile; do you feel thathaving a loading coil and a short whip materially affectsyour QSO capability, as the text books suggest, for ifnot it would seem to suggest that we could all managewith such antennae as our main base air transducers?

you have to make a compromise between /m usability and pure performance ofthe antenna I have found the short jap base loaded jobs work just as well asa centre loaded ungainly hustler when moving .......and you worry less

Post by Gareth's Downstairs ComputerA question for those who work HF mobile; do you feel thathaving a loading coil and a short whip materially affectsyour QSO capability, as the text books suggest, for ifnot it would seem to suggest that we could all managewith such antennae as our main base air transducers?

you have to make a compromise between /m usability and pure performance ofthe antenna I have found the short jap base loaded jobs work just as well asa centre loaded ungainly hustler when moving .......and you worry less

OK, but how do you find the QSOability in comparison to yourhome antenna?

Post by Gareth's Downstairs ComputerA question for those who work HF mobile; do you feel thathaving a loading coil and a short whip materially affectsyour QSO capability, as the text books suggest, for ifnot it would seem to suggest that we could all managewith such antennae as our main base air transducers?

you have to make a compromise between /m usability and pure performance ofthe antenna I have found the short jap base loaded jobs work just as well asa centre loaded ungainly hustler when moving .......and you worry less

OK, but how do you find the QSOability in comparison to yourhome antenna?(Cue: 1/4 mile nonsense from the Mongolian Hordes of nonces)

Post by Gareth's Downstairs ComputerA question for those who work HF mobile; do you feel thathaving a loading coil and a short whip materially affectsyour QSO capability, as the text books suggest, for ifnot it would seem to suggest that we could all managewith such antennae as our main base air transducers?

Post by Gareth's Downstairs ComputerA question for those who work HF mobile; do you feel thathaving a loading coil and a short whip materially affectsyour QSO capability, as the text books suggest, for ifnot it would seem to suggest that we could all managewith such antennae as our main base air transducers?

Last time I saw a mobile antennae it was attached to a cockroach.HTH HAND--

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Post by Gareth's Downstairs ComputerA question for those who work HF mobile; do you feel thathaving a loading coil and a short whip materially affectsyour QSO capability, as the text books suggest, for ifnot it would seem to suggest that we could all managewith such antennae as our main base air transducers?

Hello, and that's difficult to answer as you would have to do aside-by-side comparison of two or more antennas and it gets morecomplicated if ionospheric propagation is involved with constantlyvarying receive signal levels. Most mobile HF antennas are electricallyshort monopoles and as a result look like a capacitor in series with asmall "radiation" resistance (the conductive material of the antenna andthe vehicle body ground plane also provides some ohmic contribution).The problem is matching the transmitter's RF output impedance (nominally50 ohms) to the antenna feedpoint. For a longer antenna having a largerradiation resistance we need a lot less inductance in the loading coiland less turns means less RF power dissipation in the coil or any othercomponents comprising the matching network. I'm unsure what you mean by"base air transducer" but keep in mind this discussion is essentiallyabout omni-directional antennas. So a mobile/fixed comparison could bebetween a vehicular-mounted monopole and, say, a shunt-fed tower or anRF-fed vertical wire supported between two structures (a common antennaused in the U.S. for MW (AM) broadcast stations in the early 20th c.(also aboard ocean liners like Titanic but having rotary spark-gaptransmitters). Sincerely, and 73s from N4GGO,